static async Task AddWebhookAsync(TwitterContext twitterCtx)
        {
            try
            {
                Console.Write("What is the Webhook URL? ");
                string url = Console.ReadLine();

                AccountActivity accAct = await twitterCtx.AddAccountActivityWebhookAsync(url);

                Webhook webhook = accAct.WebhooksValue.Webhooks.SingleOrDefault();
                Console.WriteLine(
                    $"Webhook for '{webhook.Url}' " +
                    $"added with ID: {webhook.ID}, " +
                    $"created at {webhook.CreatedTimestamp}");
            }
            catch (TwitterQueryException tqe)
            {
                Console.WriteLine(tqe.Message);
            }
        }